Add MachMessageWithDeadline() and supporting characters

Add MachMessageWithDeadline() and supporting characters.

MachMessageWithDeadline() is a mach_msg() wrapper that deals with
deadlines instead of timeouts. It is a slight simplification of the
mach_msg() interface because the deadline parameter implies the timeout
option bits, and because the caller does not need to specify send_size
during sends as the message itself already carries this information.

TEST=util_test MachMessage.MachMessageDeadlineFromTimeout
R=rsesek@chromium.org

Committed: https://chromium.googlesource.com/crashpad/crashpad/+/dce497446e6fb29124bf3668d89a4302d667531d

[Mark Mentovai, 2014-12-02 21:52:11]

mark@chromium.org changed reviewers:
+ rsesek@chromium.org

[Mark Mentovai, 2014-12-02 21:52:12]

This is the second in a series of changes that improves the design of
MachMessageServer. The full set of changes are
https://codereview.chromium.org/768233003/.

This depends on https://codereview.chromium.org/772133004/.

[Robert Sesek, 2014-12-02 22:06:55]

LGTM

[Mark Mentovai, 2014-12-02 22:09:12]

Committed patchset #1 (id:1) manually as
dce497446e6fb29124bf3668d89a4302d667531d (presubmit successful).